关中平原城市群夏季城市热岛特征及驱动力

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Abstract Based on the MODIS land surface temperature (LST) products and related data of the long time series of summer 2001~2017, the spatial and temporal variation trend of surface thermal environment in Guanzhong plain urban agglomeration was revealed using Mann-Kendall non-parametric test and Sen's slope analysis. The pros and cons of the regional thermal environment was characterized by using Principal component analysis to construct the urban thermal environment index (UTEI), and the driving forces affecting LST were analyzed with the help of Geodetector. From 2001 to 2017, the average LST of Guanzhong plain urban agglomeration in summer was 29.3℃ during the daytime and 18.3℃ at night. The change rates of LST in the daytime and at night were −0.053℃/a and 0.026℃/a respectively, and the cooling rate of daytime was slightly higher than the heating rate of nighttime. Surface urban heat island intensity (SUHII) showed an upward trend during 17years. The growth rate in the daytime was higher than that at night, and SUHII in the old urban area is larger than that in the new urban area. There was a significant negative correlation between UTEI and LST, which is quadratic during the day(P<0.05, R²=0.850) and at night(P<0.05, R²=0.624). The factor detection analysis showed that normalized difference built-up and soil index(NDBSI), DEM and enhanced vegetation index (EVI) were the main controlling factors of the spatial differentiation of LST during the day (q>0.6), and LST at night was more affected by night light, aerosol optical depth (AOD) and DEM (q>0.4). The results of interactive detection showed that interaction between DEM and NDBSI was the best in the daytime, and the interaction between DEM and night light was the largest at night. The interaction between any two factors is better than that of a single factor. This study has important guiding significance for strengthening the monitoring and evaluation of the surface thermal environment in Guanzhong plain urban agglomeration.

Key words： Mann-Kendall nonparametric test principal component analysis urban heat island urban thermal environment index Geodetector

Received: 28 December 2020

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	Articles by authors
	HU Li-fa
	XIE Yuan-li
	CUI Si-ying
	ZHOU Peng
	LI Yun-mei
	SUN Shao-qi

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HU Li-fa,XIE Yuan-li,CUI Si-ying等. The characteristics and driving forces of summer urban heat island in Guanzhong Plain urban agglomeration[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3842-3852.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3842

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